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CVE-2026-21858 PoC — n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling

Source
https://github.com/cropnet/Ni8mare
Associated Vulnerability
Title:n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling (CVE-2026-21858)
Description:n8n is an open source workflow automation platform. Versions starting with 1.65.0 and below 1.121.0 enable an attacker to access files on the underlying server through execution of certain form-based workflows. A vulnerable workflow could grant access to an unauthenticated remote attacker, resulting in exposure of sensitive information stored on the system and may enable further compromise depending on deployment configuration and workflow usage. This issue is fixed in version 1.121.0.
Description
Comprehensive vulnerability detection tool for n8n workflow automation instances. Detects the critical CVE-2026-21858 vulnerability (CVSS 10.0) without performing any exploitation.
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